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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b499fa2554531ac3a0fa6675c77be824580d890a5fef322946ceb80b95c48133' 
  AND token = 'KOd5d/YB80zV3UGGkdz3ZlKxgFce7Uc72iHIzrzle5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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