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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9ed5a3bf77c26daa9b011fe597cbf95f7f888b09be7f539e6e51f7f11061d7d' 
  AND token = 'D2T7TBMIQ+zaU+h7CplnJx5sSaYcG1g1eE4akqNNLOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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