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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f55b4a8aedec368e2e89dbca96290921cc6dacee364f1e2d1efed5ad9e720b7' 
  AND token = '9eutL2AFiqyptxQrrmytnHOgOJewBjM++eIL5X0A0vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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