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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0023fbaaf302f041c7534c91cf982c3d195a8186bd92c16b55a558af2d6941ca' 
  AND token = '0rD19/R61GpMgNDDm/7OhJUqgYS10mYE8B9e8301be8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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