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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d03d875321664c20ec73f540fd4c207cb60c22023731bfa1243de77628232b3' 
  AND token = 'lOXq8w7fdpGiz0XpY24VqoggTk7V2ruokL0A05/YpoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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