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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '176d6d85df009efe41a43818e61cb665628baa7c2f75ce99068c91d2e1c089c4' 
  AND token = '5fKenIOzJB+2WqlWfgIJ5LaTWTn7k+VJ3DBkRPCTrUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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