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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f68aa3396b3914ee22e3d9f6843c27106d42429279dbb42e7c78825b3daeabe4' 
  AND token = 'ZQkToOfeoTaA7O05xuonseQChhkpCNGY/JF+G75X4AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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