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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f139d3d18a4902e368f94b7b2ba844f38904c26b341a5ea007a020e3bbf1c75' 
  AND token = '4nixcrK4Zf3iqo4p+aRz+1zGH8YTg5Wm0YRvu0naTeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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