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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8fc3565a07df34c0d55a44366414e62a7f6373b220b6e5dd3de1fbf3c383982' 
  AND token = 'i8LSA0cB21ajbX4URJI5X8oHf6uUs0u7Ni+kS/v5Gq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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