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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79eb6017b68794e948370de4aca6cdb4925e46f69283c7f7810306de1c8ad813' 
  AND token = 'k2hk06sxXBYWGheVIh/045aRsqGm41hJMB2EwwtePAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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