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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '485adeb47a384635115c5660e4c19988b8587921ee3ebfd3810c832495ef090e' 
  AND token = 'hWpG9jdc6yDI4m3RprjoE5EXcOVPC9XtXhj20m47S08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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