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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6afc919d25eab02f5f542c267e330c9a65e0610faa276865abcd2f1d90482955' 
  AND token = 'Ob7n6krtVt553rtgYy7FuAt0hx8fLKwiGpk0D9pWr+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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