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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add22e628d6c124f075d40edefd63e5108340430a792fe725a356e2bc05cdf18' 
  AND token = 'TWllFOeeu6R13o30cmGt/qbbu+ZJlV+4gIDWG2Afq0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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