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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6146a435c1812c2263c4f11fb08ed39ebfea225b14163a418ebba1f84907cb1' 
  AND token = 'D3vJOBu1QEmXBVqT45WpPxU6SpLEV/CFqz0r63Pd5+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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