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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d6158813a12f5791fc1db0556b9a68ba56198a56fb7d82e6916c0f2b72a775b' 
  AND token = 'ciHzdoU6i1KfEWvifzHYEKtKpVAsC3rvD0mEKm3sE5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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