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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4954f8d008af08a53cce85162458b3d0924015b38a9d54e8e2f968e99063ac4' 
  AND token = 'PIX41H+Z7OKXke/XJnMR8b3CfywhidczP7gS+WsQkx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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