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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9094d4c5a7086f0d2c3893368f673c370877ad523a4030b2a239a158d435f175' 
  AND token = 'eGV/QP1Y0h3IhAYfKB7cYyX3RqvaZnGFtMnCREtNE1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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