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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce4474381c370dce03f3ddec8d8fc6dfc7d776db6a8a2e1f189fa2378d8e77d9' 
  AND token = '+gGhybshiaIbGJQ4c765AVe/4l2klMouH40HNCJl8zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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