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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '052cf391b857ef9c0f18aecf991f893eb28582a4e5c40181da5a26eb3848fbc5' 
  AND token = 'jC1Y/nlBuS55ob/bLGoku9d8WMUCBsR+uNaeeUw6DXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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