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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b90550d1f6f53aeb392c2408ba2d501e1b4fe270416165a698385983183fa0ef' 
  AND token = 'ER2gFbnHsWR3Cw7DRl8MhIorXoU4hv0MbWuUe3jhuwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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