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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '544eb975851298bfa7e9978fe96be8ef0c4a8c808e16d68625c08d1ddbd6be54' 
  AND token = 'CD8TxEzYojokzS1xDXdrktEtSBoyQh5HSS1oppBe2Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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