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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712a2fc88494a8fb4cbf6532b8869ad529e0a590ca01f63d455bb490059dc66d' 
  AND token = '6+Ic47ALQ7dIcFDVlwG+ro89cGZrF+DT5hTDw2nbUXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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