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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4130fd5ea7de4032d01b521c1cd413b00c00ac98ae69aad3ec7cd4b57275077' 
  AND token = 'Dzk2N5PvUA3Ei3GJsJXPngvrN3WLBmlnoGKsChU0p2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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