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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eb5cddf9dc4a6197e2dbb4038b81b916b4f6bd851df5cadc76a9c8ce435a905' 
  AND token = '0TkIq9lgke7Rj4sqg7+uiGknwn8yzGOLfd/IB3S1HHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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