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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3504d78ce97a9f396cff46245d961edc06daa78cc257855ebd6eb369504f95a' 
  AND token = 'j1eHoq7e8Y8mz3qfu45X/HpBuPeHs4e5toB2tk49uCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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