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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffd21284bb59f42b037dfe5c2800b995875ff58e3b1a4208407bf45bd7899fd7' 
  AND token = 'GcSpEvtVTPiSTt4yy4VZeu03T8bxhZhX9/aWb3nc9O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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