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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23eff7a3f3da97a189122820feabe9b122ea4ecc0c5e359063b6a7859587ad9e' 
  AND token = '0ul2HgpUqCnAtpXQft2qZneOKK0DzqIu77eex7o6sVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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