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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d16223f60d5b5447c4899ac66500973bd39fe39ce64863d45d9160de4bed3de' 
  AND token = '9TQ8I855y7xnQ4jHRgPuRzKkj9hUs0TR+dd0hIPvy7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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