SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7717d3029ae51b04b7c22c6147e711ca52c46fd61c622cf51835d69b3d87af8b' 
  AND token = '7aiCJiPmmEhU/GPWsqOlcR/FVFZDjIMUHtMCAvbDxqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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