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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '911bdf20ad7c8cb0db8ac9081b876d3684bbaa43966f916b163427a3707bd470' 
  AND token = 'Xz1KfDiCNBvDE4dg7SffqddXQKju6i7BBzj1wFCXhqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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