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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5d464dfc213c0d50cdc2e0abf913ce4ee9959a6c0a812d7ab31aecce95c9231' 
  AND token = '0nkAXhYgyeYgk1UF7TvrLScT+jiEN3mmR1yuuxEaD+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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