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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e633e1c58f06c93d16c13596190f9cd76ba9d2f363b9bf5d49011c7f503031bd' 
  AND token = 'LSH+Jyg77ukvd4+HsTGUK/2rYT7FB3lQr527JX0GFnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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