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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634868483afae5db78ad2e43efcd08fe9c8dae1db044a3f63f48ff7a95d57181' 
  AND token = 'zkk6ehlkabo7nY2f8Da/6zPYhpae881FVtcZT/hphYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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