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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '247e5876631a9596b32665f2d459b5828d061b7845235a05724be0faa52171e4' 
  AND token = 'Xcwj1V9QrUlUxtfNEa6tcoW9r0AkXPEgAOTvnCA8ScI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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