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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45c43796242ac2eb9c370773b129266ef89e61e77cb04135e4668f7350dae597' 
  AND token = 'Q1nlLw6A+7MiTwp3yBF47uHLaVeeoF27sJXy83I6iuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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