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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b20b6b236025d1453a37ec7b9eedb111ae237f6f5b4c54d92e8794f4aafe8cf' 
  AND token = 'BnpxjDgBsJu3WE3U5RTYGeKci2oF0c6YlRXk+2d4XHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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