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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f29f932546226c4ec46b29d2de232363cc4742e36d2968ac4f751a00cc46aae4' 
  AND token = 'WW5XUJZiv5brFnIsxO2IYASzVoNl7791JhOyy7OxaRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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