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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b431174e7c9e04f3bea10828d80734805ad42cef3ec4ed142498e933d776f7' 
  AND token = '4n4WF31FLR7rdtwjYtwz2N1vp56oHiGc1uZhUypjETk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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