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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3671373cc3f8e55d9f0d7a3e0f11f40ad1b75eafb7fd9e48b2c5170c2fc6e5f' 
  AND token = '7MseieL235Q3SxSPhoPo0FIX0Ip/YnXKzyChAkCADMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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