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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b6ea36e97935654b14bd786cbf69eebae570a176fcf177c652fb12f1fcc9e63' 
  AND token = 'ZvudaHf27sXigzIqhDuMZFodoGjwjk62Hrz3uGYYu9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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