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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95aa2f9e9a6e1436b261b24a154f10abd0bde174a6483c58064e265bb6e4bff2' 
  AND token = 'ywRiQj6+DVs1QaW0HezBsdxSvzYCoAduj684jJ0rqeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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