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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cdc62bfba28f516826ca7fc4e9c0d049776153402a003b04dd71a14cbecc982' 
  AND token = 'IRWKLogikhfUpi1FrMFXjT2i3bNhomW+3C3LSvpQm7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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