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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '301d19a9ec1114852d9f5af12800eee23bf8415df65a40cd030b3be131432630' 
  AND token = 'dbqGg3T+7MErgE7jHOrWS+5798JhMLaddsbEhh1/X2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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