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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3b7fa66d960d79c438f4c2bb564800e6d725c00bc82eb148e3c3b987caa7032' 
  AND token = '2mLwj79m/ylo2dlwiZDjJ6cczMf6Op6QYl6g3hysyus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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