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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '399a202e09ee93f8447228bd5457baf1b5ad4d5abd2755e5c3c76196d75e2f00' 
  AND token = 'Gt328W/yUSswfkU8yLV7X45UO8QpfnXQy391sG/S0UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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