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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f58bbd1a105fb0489bd7fa7f52a43ffa92a4f4b218939db63ad1058da6ef10f5' 
  AND token = 'd1hWM3Z00rtOD4eYOXP5zIbl0gCfPcP63Rr7PyV1YbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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