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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd0148fa960bede3321234708c4cf631cd2e6fadd2eda10861c5e6ff588f06c6' 
  AND token = 'b58NZiAJKkxcPTEu0GHISwD47Y9Vo4L4Rrz8qQEfTE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}