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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dca0fa50d9331939d0aef9f44afea12eae1f6df716841113d345ae6af798b096' 
  AND token = 'RGbZ21v1B/iqmS/wIr77tNvrKyPj6wuDubG8L0qXHA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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