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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f6f7b6ddf00ad646dd962999dba0a9135bd6dddeb0e28e5b65a673f81f5fcad' 
  AND token = 'ubjdh3kYXZwDwTL1ao/dOPnFxpwjMZTY9fJNXrnipco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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