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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebdc2140d7833cabe8cbfc9ff5b6c4aeb254526d34660ce335f8bc71c72425c3' 
  AND token = '0iW99ag+qEPuvhHvy8EhbLza2lQTPZgnCGwv42vq41U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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