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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a574fef671291f47b71a9e5aa0cd6160b0bb0065fec140af59aa8dbd5a9632d4' 
  AND token = 'xIvqKY7g91q8aSbWxwKjHuqtC7aX7+6VgHJUKnvdx/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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