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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15110511b36da6fc222c3383e1d5b4fefc7d7bfbe04ea349baf6390caa607395' 
  AND token = 'VZ4ySd30WvKmPst25PIDOtOTxgp1pYS5OMMJDdQAIcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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