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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfe3fbb25f2af6f6e90ba5c5cd945c1003bdde9f2eb6f2363f1991dea1ea0f2c' 
  AND token = 'dkkEp6wMFtyaFUKFzl9Ew8Afzjzm4UBMWai8cGyzxsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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