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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b40d28c3dcdae907f5000c64a4cdf55eb575a46b417593d71804541bba22512b' 
  AND token = 'tvSlVdkGUOn59BDgGLaAhJl8KZpCLUaT0jS0O0uMpVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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