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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f89680a6cce0b696cdc5800781a296d5dcbbe0be4ec6092e9c6ab9c446453928' 
  AND token = 'ZWScYPdIE3fuK/8t4PVz5hNjYzacS1ZJhMB2pnWEIRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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