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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0ef65e2ed267e49d09cc7ea040ac19149a491ffe3508f003f42780bf768f413' 
  AND token = 'GvO8lM0HI8CiKl37EDegWQdVDYfaNpDVS6+i157cq30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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