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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6470b368657047dafeb22da9a0ee770a20d1e9f80a734ff7e0206ba39e4e175d' 
  AND token = 'jUwdSs0k4CX1TaedGo5Egbiapdg1N3bP25M3wwJLZR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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