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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '465c33761a29afce29e4d840612fbd1597ac935d9c46dee2ff2c0cec67a8adb9' 
  AND token = 'Ps1VdzYCBx5bSiQBzxUu07K4aF7vSMNWXWiW7rChkXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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