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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '401c4e492c0d992c1ed7a4f27100bb307b367e30d0d97dedf5ec7661481b8bf8' 
  AND token = 'D38OoryNcBG0eeU7cem4FBjM2q8keXhijXmCj9gtOuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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