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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd137fc1ae80b276ac30f93853061ee4b04a5d1cb501b3e60efeba1b21cf88f83' 
  AND token = 'uOAy0pQ3109h7vLoBsEr1Zk0tkLvbUvvKjTQKHv2rFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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