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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a890eb2a377b023aa28aaeb666e25c1862d482df754c19acf869a2719331c34' 
  AND token = 'NeHj2uKyXAULJtyq4OlD0v5A0mdRaTw9nRw1KjKqiw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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