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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a070b8591a834a8c8da7360c3580c605cf9971ce1a12ec365b2284505b4bc653' 
  AND token = 'SfXmmXkc/x0CG9cS1/3S0W8d1dJutbZF5nSCISnZLyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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