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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04cb934143e83af60f8d64acb50f66321bad91d79ab0b13a1bae71fa3712caba' 
  AND token = 'vgGukhV1QePzuJT/dXsxt8NeC7GhQHQ4hPBk7ZLCJxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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