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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed6617f0641bb7b27bb850eba0a4ddc6ee15b547a565e1eb0e5f951ad681916' 
  AND token = 'sF0l7FKWAYBUAnTvMhoeU+EbsApAPCAj5ygVmvgK+YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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