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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0abea03b511d47382422f3dcf6a30ffb8e7d6890c3a7ee8835003165950de8c4' 
  AND token = 'OHCUtIrT31TOS84qlUrnGg7yZweNQ5T65o7Q5BI6GdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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