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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5b1fe916b4565b5ce35a5f2f40479ab99a9a3d059a1ed4648ccc78dc5dce0d9' 
  AND token = '9OYqragcZQ+ZGfMmy2OMoMdf3hoOHAMxQq7FecD9tgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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